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BUG#30385: Server crash when deleting with ORDER BY and LIMIT

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in get_index_for_order(), don't walk over the end of the index key parts
when matching index description and needed ordering.


mysql-test/r/delete.result:
  BUG#30385: Testcase
mysql-test/t/delete.test:
  BUG#30385: Testcase
This commit is contained in:
unknown 2007-09-10 16:26:51 +04:00
parent 10012b36fe
commit 732f05a642
3 changed files with 26 additions and 1 deletions
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11
mysql-test/r/delete.result
View File

@ -193,4 +193,15 @@ select @a;
@a
1
drop table t1;
CREATE TABLE t1 (
`date` date ,
`time` time ,
`seq` int(10) unsigned NOT NULL auto_increment,
PRIMARY KEY (`seq`),
KEY `seq` (`seq`),
KEY `time` (`time`),
KEY `date` (`date`)
);
DELETE FROM t1 ORDER BY date ASC, time ASC LIMIT 1;
drop table t1;
End of 4.1 tests

13
mysql-test/t/delete.test
View File

@ -184,4 +184,17 @@ delete from t1 where (@a:= f1) order by f1 limit 1;
select @a;
drop table t1;
# BUG#30385 "Server crash when deleting with order by and limit"
CREATE TABLE t1 (
`date` date ,
`time` time ,
`seq` int(10) unsigned NOT NULL auto_increment,
PRIMARY KEY (`seq`),
KEY `seq` (`seq`),
KEY `time` (`time`),
KEY `date` (`date`)
);
DELETE FROM t1 ORDER BY date ASC, time ASC LIMIT 1;
drop table t1;
--echo End of 4.1 tests

3
sql/opt_range.cc
View File

@ -825,6 +825,7 @@ uint get_index_for_order(TABLE *table, ORDER *order, ha_rows limit)
if (!(table->keys_in_use_for_query.is_set(idx)))
continue;
KEY_PART_INFO *keyinfo= table->key_info[idx].key_part;
uint n_parts= table->key_info[idx].key_parts;
uint partno= 0;
/*
@ -834,7 +835,7 @@ uint get_index_for_order(TABLE *table, ORDER *order, ha_rows limit)
*/
if (!(table->file->index_flags(idx, 0, 1) & HA_READ_ORDER))
continue;
for (ord= order; ord; ord= ord->next, partno++)
for (ord= order; ord && partno < n_parts; ord= ord->next, partno++)
{
Item *item= order->item[0];
if (!(item->type() == Item::FIELD_ITEM &&